Structure, transport and photoconductance of PbS quantum dot monolayers functionalized with a copper phthalocyanine derivative
A. André (Eberhard Karls Universität Tübingen)
C. Theurer (Eberhard Karls Universität Tübingen)
J.D. Lauth (TU Delft - ChemE/Opto-electronic Materials)
S. Maiti (Eberhard Karls Universität Tübingen)
M. Hodas (Eberhard Karls Universität Tübingen)
M. Samadi Khoshkhoo (Eberhard Karls Universität Tübingen)
S Kinge (Toyota Motor Europe)
Alfred Meixner (Eberhard Karls Universität Tübingen)
F. Schreiber (Eberhard Karls Universität Tübingen)
L.D.A. Siebbeles (TU Delft - ChemE/Opto-electronic Materials)
K. Braun (Eberhard Karls Universität Tübingen)
M. Scheele (Eberhard Karls Universität Tübingen)
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Abstract
We simultaneously surface-functionalize PbS nanocrystals with Cu 4,4′,4′′,4′′′-tetraaminophthalocyanine and assemble this hybrid material into macroscopic monolayers. Electron microscopy and X-ray scattering reveal a granular mesocrystalline structure with strong coherence between the atomic lattice and the superlattice of nanocrystals within each domain. Terahertz spectroscopy and field-effect transistor measurements indicate efficient coupling of holes throughout the hybrid thin film, in conjunction with a pronounced photoresponse. We demonstrate the potential of this material for optoelectronic applications by fabricating a light-effect transistor.